Improvement in machines for grinding rolls



N. GAVIT. Machines for Grinding 146,247.

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UNITED STATES PATENT OFFICEo NELSON GAVIT, OF PHILADELPHIA,PENNSYLVANIA. I

IMPROVEMENT IN MACHINES FOR GRINDING ROLLS.`

Specificationforming part of Letters Patent No. 146,247, dated January6, 1874; application filed July 11, 1873. l

To all'whom 'it may concern:

Be it known that I, NELSON GAVIT, of the city of Philadelphia and Stateof Pennsylvania, have invented an Improvement in Machines for GrindingRolls of Irregular Diameters, of which the following is a specilication:

My invention relates to that class of machines in which a form-plate isused to guide the grinding wheel or wheels in their longitudinalmovement from end to end of the roll to be ground. The inventionconsists in the combination of swinging frames carrying grinding-wheelswith a sliding bed-plate moving on a stationary bed-plate, and with apatternplate situated above the roll to be ground. The said frames,which are situated at opposite sides of the machine, are connected at`their lower ends with adjusting-screws. Their upper ends are connected,by means of springs and adjusting-screws, with slides, which move alongthe opposite edges of the pattern-plate. The proximate distance of thegrinding-wheels from the center of the roll to be ground maybe given 'bythe adjustment of both the upper and lower screws; but the exactadjustment is given by means of the lower screws, as a very accurateadjustment may thereby be made on account of the much greater distanceof these screws than the grinding-wheels from said slides.

I am not aware that any plan has heretofore been adopted to give theexact form required in an expeditious manner.

Figure lis a plan view of my improved machine. Fig. 2, Sheet No. 2, is aside elevation of the same. Fig. 3, Sheet No. 3, is a cross-section atthe line x .r of Fig. 2. Fig. 4 is a top or side view of the form-plate,showing, by means of parallel lines, the amount of swell of the plate.

Like letters in all the figures indicate the same parts.

A is the bed-plate of the machine. B B are standing heads,which supportthe pattern or form plate O and the roll D to be ground. Thepattern-plate `is confined on the top of the heads B B by means ofscrews a a, being Iirst adjusted so as to be perfectly vertical with theaxis of the roll D by means of the set-screws b b b b. E is a slidingbed-plate on the permanent bed-plate A, and capable of being moved fromend to end of the machine by means of the carrying-screw F. Incombination with the bed-plate E are sliding stocks G G, which areadjusted by means of the screws H H, which pass through the blocks G G.I I are grinding-wheels on the revolving shafts J J, which are supportedby the swinging frames K K: The frames are I hung at their lower ends onthe pins L L', which project from the stocks` GG. They are adjusted attheir upper ends, so as to bring the grinding-wheels I I to their properposition for grinding the roll D, by means of the set-screws c c, whichbear against the grooved slides M M, Vand bear them against the edgesofthe form-plate, as seen in Figs. 1, 2, and 3,

the ends of the screws being held tight against the slide by means ofthe springs N N, the heels of which are permanently secured to thestocks G G. l

The grinding-wheels may be set in proper position from the roll D byvregulating either The roll D and carrying screw-rod F are' connected bymeans of gearing. (Not shown in the drawings.)

As the sliding bed-plate E travels forward, so as to cause thc grindingwheels I I to pass from one end of the roll D to the other, theirdistance apart is varied by means of the pattcrnplate C and adjustableframes'K K, arranged as above described, so as to cause the roll to beground of the exact form of the pattern-plate, the diameter of the rollbeing regulated by means of the set-screws H H and c c. It will be seenthat rolls may be ground smaller in the middle instead of swelled, or ofany desired curvature longitudinally, by giving the exact form desiredto the pattern-plate O.

I claim as my invention` The combination of the swinging frames K K,carrying the grinding-wheels I I, the pattern-plate O, arranged abovethe roll to be` ground, slides M M, set-screws c c, springs N N, slidingstocks G Gr, and adjusting-screws H H, substantially as described. l

Witnesses: NELSON GAVIT.

STEPHEN UsTIoK, j i GHAs. GRrGes.

